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  • American Institute of Physics (AIP)  (2)
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  • American Institute of Physics (AIP)  (2)
  • Springer  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Experimental investigation of the helical magnetic instability of an arc discharge in an axial magnetic field and comparison with theory (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 2274-2279 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The helical magnetic instability of arcs is investigated experimentally at a long low current H2 arc in a tube of 20 mm diam. The measurements are compared with theoretical results given in a preceding paper [Phys. Fluids 30, XXXX (1987)] in which a first order homogeneous differential equation for the helix amplitude was derived from the basic differential equations. Confirmation is achieved for the critical external axial magnetic field which just destabilizes the arc. It amounts to only a few gauss. Agreement is also found for the growth rate of the instability in both cases of destabilization by an external magnetic field and by the self-magnetic field. The measured growth rates have an order of magnitude of 1000 sec−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866162
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The helical magnetic instability of arcs in an axial magnetic field treated by a linear time dependent perturbation theory (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 2266-2273 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A straight arc column operated in a cylindrical tube changes its shape into a helical form if the strength of the arc current, the gas pressure, or a superimposed axial magnetic field exceed marginal values. The helical arc is described by the electromagnetic equations in an electrostatic approximation and by the balances of mass, momentum, and energy. The critical nonlinear term is the Lorentz force. The equations are solved by linear perturbation theory. A first order differential equation is deduced for the helix amplitude from which the stability limit of the cylindrical arc and the growth rate of the helical instability can be evaluated. The ratio of the destabilizing and stabilizing terms in the equation is determined by a dimensionless number, the Maecker number, which comprises integral properties of the arc and properties of the gas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866161
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    Paper (German National Licenses)
    Fulltext
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